Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716469.0, MPI für Physik / YB 2016
First observation of the hadronic transition $\\Upsilon(4S) \\to \\eta h_{b}(1P)$ and new measurement of the $h_b(1P)$ and $\\eta_b(1S)$ parameters
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys.Rev.Lett.
Issue / Number:115
Start Page:142001
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Using a sample of $771.6 \\times 10^{6}$ $\\Upsilon(4S)$ decays collected by the Belle experiment at the KEKB $e^+e^-$ collider, we observe for the first time the transition $\\Upsilon(4S) \\to \\eta h_b(1P)$ with the branching fraction ${\\cal B}[\\Upsilon(4S) \\to \\eta h_b(1P)]= (2.18 \\pm 0.11 \\pm 0.18) \\times 10^{-3}$ and we measure the $h_b(1P)$ mass $M_{h_{b}(1P)} = (9899.3 \\pm 0.4 \\pm 1.0)$ MeV/$c^{2}$, corresponding to the hyperfine splitting $\\Delta M_{\\mathrm HF}(1P) = (0.6 \\pm 0.4 \\pm 1.0)$ MeV/$c^{2}$. Using the transition $h_b(1P) \\to \\gamma \\eta_b(1S)$, we measure the $\\eta_b(1S)$ mass $M_{\\eta_{b}(1S)} = (9400.7 \\pm 1.7 \\pm 1.6)$ MeV/$c^{2}$, corresponding to $\\Delta M_{\\mathrm HF}(1S) = (59.6 \\pm 1.7 \\pm 1.6)$ MeV/$c^{2}$, the $\\eta_b(1S)$ width $\\Gamma_{\\eta_{b}(1S)} = (8 ^{+6}_{-5} \\pm 5)$ MeV/$c^{2}$ and the branching fraction ${\\cal B}[h_b(1P) \\to \\gamma \\eta_b(1S)]= (56 \\pm 8 \\pm 4) \\%$.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:7 pages, 2 figures, submitted to Phys. Rev. Lett
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
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